Phospholipids have hydrophobic tails and hydrophilic heads that form a bilayer in cell membranes, separating internal and external environments.
Phospholipids are amphipathic molecules that have a hydrophobic (water-fearing) part consisting of fatty acid chains and a hydrophilic (water-loving) part composed of a phosphate-containing group. The hydrophilic head interacts with water, while the hydrophobic tail avoids it. In a membrane, phospholipids align to form a bilayer with hydrophobic tails inside and hydrophilic heads facing the watery environment, creating a barrier between the cell's interior and exterior.
https://brainly.com/question/30414447